Correlations between brain electrical activities of two spatially separated human subjects

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Plain English Summary

Can one person's brain react when something happens to someone else in a completely separate, sealed room? This carefully designed study says yes — and the kicker challenges a popular assumption. Researchers recorded brainwaves from pairs of people sitting in electromagnetically shielded rooms (basically Faraday cages blocking all signals). One person was shown flashing visual patterns while the other just relaxed. When they analyzed the relaxing person's brain activity using strict statistical methods, they found unusual spikes that lined up with the stimulation — and this happened significantly more than chance would predict. Here's the really surprising part: it didn't matter whether the pairs were emotionally close or total strangers. Both groups showed the same effect, which throws a wrench into the idea that you need some special emotional bond for this kind of brain-to-brain connection. Published in a mainstream neuroscience journal, this is one of the more methodologically tight studies in the field.

Actual Paper Abstract

Six channels electroencephalogram (EEG) were recorded simultaneously from pairs of separated human subjects in two acoustically and electromagnetically shielded rooms. While brain electric responses to visual pattern-reversal stimuli were elicited in one subject, the other subject relaxed without stimulation. EEGs of both subjects were averaged at times of stimulus onset, effective voltage of the averaged signals was computed within a running window, and expressed as ratio (Q) to the effective voltage of averaged EEG signal from non-stimulation periods. These ratios in non-stimulated subjects at the latency of the maximum response in stimulated subjects were analysed. Signiﬁcant departures of Q ratios from reference distributions, based on baseline EEG in non-stimulation periods, were found in most non-stimulated subjects. The results indicate that correlations between brain activities of two separated subjects may occur, although no biophysical mechanism is known.

Research Notes

Methodologically rigorous extension of Grinberg-Zylberbaum's 'transferred potential' paradigm, using shielded rooms, pattern-reversal stimuli, and non-parametric randomization statistics. Published in a mainstream neuroscience journal. Key finding that unrelated pairs showed the same effect challenges empathic-bond hypotheses central to this debate.

Six-channel EEGs were recorded from pairs of spatially separated subjects in electromagnetically and acoustically shielded rooms. One subject received 72 visual pattern-reversal stimuli while the other relaxed. Thirty-eight participants formed four groups: related pairs with empathic tuning-in (E1, 7 pairs), unrelated pairs (E2, 7 pairs), sham-stimulation controls (K1, 3 pairs), and single-subject controls (K2, 4 individuals). Non-parametric randomization statistics showed outlier counts in non-stimulated subjects' EEGs deviated strongly from Poisson fits in both experimental groups versus controls (G=14.13, 4 d.f., P < 0.01). The effect appeared equally in related and unrelated pairs, challenging the assumption that emotional connectedness is essential.